- /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
- *
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.] */
-
- #include <openssl/ssl.h>
-
- #include <assert.h>
- #include <limits.h>
-
- #include <openssl/ec.h>
- #include <openssl/ec_key.h>
- #include <openssl/err.h>
- #include <openssl/evp.h>
- #include <openssl/mem.h>
- #include <openssl/type_check.h>
-
- #include "internal.h"
- #include "../crypto/internal.h"
-
-
- int ssl_is_key_type_supported(int key_type) {
- return key_type == EVP_PKEY_RSA || key_type == EVP_PKEY_EC ||
- key_type == EVP_PKEY_ED25519;
- }
-
- static int ssl_set_pkey(CERT *cert, EVP_PKEY *pkey) {
- if (!ssl_is_key_type_supported(pkey->type)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNKNOWN_CERTIFICATE_TYPE);
- return 0;
- }
-
- if (cert->chain != NULL &&
- sk_CRYPTO_BUFFER_value(cert->chain, 0) != NULL &&
- /* Sanity-check that the private key and the certificate match. */
- !ssl_cert_check_private_key(cert, pkey)) {
- return 0;
- }
-
- EVP_PKEY_free(cert->privatekey);
- EVP_PKEY_up_ref(pkey);
- cert->privatekey = pkey;
-
- return 1;
- }
-
- int SSL_use_RSAPrivateKey(SSL *ssl, RSA *rsa) {
- EVP_PKEY *pkey;
- int ret;
-
- if (rsa == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- pkey = EVP_PKEY_new();
- if (pkey == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_EVP_LIB);
- return 0;
- }
-
- RSA_up_ref(rsa);
- EVP_PKEY_assign_RSA(pkey, rsa);
-
- ret = ssl_set_pkey(ssl->cert, pkey);
- EVP_PKEY_free(pkey);
-
- return ret;
- }
-
- int SSL_use_RSAPrivateKey_ASN1(SSL *ssl, const uint8_t *der, size_t der_len) {
- bssl::UniquePtr<RSA> rsa(RSA_private_key_from_bytes(der, der_len));
- if (!rsa) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- return 0;
- }
-
- return SSL_use_RSAPrivateKey(ssl, rsa.get());
- }
-
- int SSL_use_PrivateKey(SSL *ssl, EVP_PKEY *pkey) {
- if (pkey == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- return ssl_set_pkey(ssl->cert, pkey);
- }
-
- int SSL_use_PrivateKey_ASN1(int type, SSL *ssl, const uint8_t *der,
- size_t der_len) {
- if (der_len > LONG_MAX) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return 0;
- }
-
- const uint8_t *p = der;
- EVP_PKEY *pkey = d2i_PrivateKey(type, NULL, &p, (long)der_len);
- if (pkey == NULL || p != der + der_len) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- EVP_PKEY_free(pkey);
- return 0;
- }
-
- int ret = SSL_use_PrivateKey(ssl, pkey);
- EVP_PKEY_free(pkey);
- return ret;
- }
-
- int SSL_CTX_use_RSAPrivateKey(SSL_CTX *ctx, RSA *rsa) {
- int ret;
- EVP_PKEY *pkey;
-
- if (rsa == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- pkey = EVP_PKEY_new();
- if (pkey == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_EVP_LIB);
- return 0;
- }
-
- RSA_up_ref(rsa);
- EVP_PKEY_assign_RSA(pkey, rsa);
-
- ret = ssl_set_pkey(ctx->cert, pkey);
- EVP_PKEY_free(pkey);
- return ret;
- }
-
- int SSL_CTX_use_RSAPrivateKey_ASN1(SSL_CTX *ctx, const uint8_t *der,
- size_t der_len) {
- RSA *rsa = RSA_private_key_from_bytes(der, der_len);
- if (rsa == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- return 0;
- }
-
- int ret = SSL_CTX_use_RSAPrivateKey(ctx, rsa);
- RSA_free(rsa);
- return ret;
- }
-
- int SSL_CTX_use_PrivateKey(SSL_CTX *ctx, EVP_PKEY *pkey) {
- if (pkey == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_PASSED_NULL_PARAMETER);
- return 0;
- }
-
- return ssl_set_pkey(ctx->cert, pkey);
- }
-
- int SSL_CTX_use_PrivateKey_ASN1(int type, SSL_CTX *ctx, const uint8_t *der,
- size_t der_len) {
- if (der_len > LONG_MAX) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_OVERFLOW);
- return 0;
- }
-
- const uint8_t *p = der;
- EVP_PKEY *pkey = d2i_PrivateKey(type, NULL, &p, (long)der_len);
- if (pkey == NULL || p != der + der_len) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_ASN1_LIB);
- EVP_PKEY_free(pkey);
- return 0;
- }
-
- int ret = SSL_CTX_use_PrivateKey(ctx, pkey);
- EVP_PKEY_free(pkey);
- return ret;
- }
-
- void SSL_set_private_key_method(SSL *ssl,
- const SSL_PRIVATE_KEY_METHOD *key_method) {
- ssl->cert->key_method = key_method;
- }
-
- void SSL_CTX_set_private_key_method(SSL_CTX *ctx,
- const SSL_PRIVATE_KEY_METHOD *key_method) {
- ctx->cert->key_method = key_method;
- }
-
- static int set_algorithm_prefs(uint16_t **out_prefs, size_t *out_num_prefs,
- const uint16_t *prefs, size_t num_prefs) {
- OPENSSL_free(*out_prefs);
-
- *out_num_prefs = 0;
- *out_prefs = (uint16_t *)BUF_memdup(prefs, num_prefs * sizeof(prefs[0]));
- if (*out_prefs == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- *out_num_prefs = num_prefs;
-
- return 1;
- }
-
- int SSL_CTX_set_signing_algorithm_prefs(SSL_CTX *ctx, const uint16_t *prefs,
- size_t num_prefs) {
- return set_algorithm_prefs(&ctx->cert->sigalgs, &ctx->cert->num_sigalgs,
- prefs, num_prefs);
- }
-
-
- int SSL_set_signing_algorithm_prefs(SSL *ssl, const uint16_t *prefs,
- size_t num_prefs) {
- return set_algorithm_prefs(&ssl->cert->sigalgs, &ssl->cert->num_sigalgs,
- prefs, num_prefs);
- }
-
- int SSL_CTX_set_verify_algorithm_prefs(SSL_CTX *ctx, const uint16_t *prefs,
- size_t num_prefs) {
- return set_algorithm_prefs(&ctx->verify_sigalgs, &ctx->num_verify_sigalgs,
- prefs, num_prefs);
- }
-
- int SSL_set_private_key_digest_prefs(SSL *ssl, const int *digest_nids,
- size_t num_digests) {
- OPENSSL_free(ssl->cert->sigalgs);
-
- OPENSSL_COMPILE_ASSERT(sizeof(int) >= 2 * sizeof(uint16_t),
- digest_list_conversion_cannot_overflow);
-
- ssl->cert->num_sigalgs = 0;
- ssl->cert->sigalgs =
- (uint16_t *)OPENSSL_malloc(sizeof(uint16_t) * 2 * num_digests);
- if (ssl->cert->sigalgs == NULL) {
- OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
- return 0;
- }
-
- /* Convert the digest list to a signature algorithms list.
- *
- * TODO(davidben): Replace this API with one that can express RSA-PSS, etc. */
- for (size_t i = 0; i < num_digests; i++) {
- switch (digest_nids[i]) {
- case NID_sha1:
- ssl->cert->sigalgs[ssl->cert->num_sigalgs] = SSL_SIGN_RSA_PKCS1_SHA1;
- ssl->cert->sigalgs[ssl->cert->num_sigalgs + 1] = SSL_SIGN_ECDSA_SHA1;
- ssl->cert->num_sigalgs += 2;
- break;
- case NID_sha256:
- ssl->cert->sigalgs[ssl->cert->num_sigalgs] = SSL_SIGN_RSA_PKCS1_SHA256;
- ssl->cert->sigalgs[ssl->cert->num_sigalgs + 1] =
- SSL_SIGN_ECDSA_SECP256R1_SHA256;
- ssl->cert->num_sigalgs += 2;
- break;
- case NID_sha384:
- ssl->cert->sigalgs[ssl->cert->num_sigalgs] = SSL_SIGN_RSA_PKCS1_SHA384;
- ssl->cert->sigalgs[ssl->cert->num_sigalgs + 1] =
- SSL_SIGN_ECDSA_SECP384R1_SHA384;
- ssl->cert->num_sigalgs += 2;
- break;
- case NID_sha512:
- ssl->cert->sigalgs[ssl->cert->num_sigalgs] = SSL_SIGN_RSA_PKCS1_SHA512;
- ssl->cert->sigalgs[ssl->cert->num_sigalgs + 1] =
- SSL_SIGN_ECDSA_SECP521R1_SHA512;
- ssl->cert->num_sigalgs += 2;
- break;
- }
- }
-
- return 1;
- }
-
- typedef struct {
- uint16_t sigalg;
- int pkey_type;
- int curve;
- const EVP_MD *(*digest_func)(void);
- char is_rsa_pss;
- } SSL_SIGNATURE_ALGORITHM;
-
- static const SSL_SIGNATURE_ALGORITHM kSignatureAlgorithms[] = {
- {SSL_SIGN_RSA_PKCS1_MD5_SHA1, EVP_PKEY_RSA, NID_undef, &EVP_md5_sha1, 0},
- {SSL_SIGN_RSA_PKCS1_SHA1, EVP_PKEY_RSA, NID_undef, &EVP_sha1, 0},
- {SSL_SIGN_RSA_PKCS1_SHA256, EVP_PKEY_RSA, NID_undef, &EVP_sha256, 0},
- {SSL_SIGN_RSA_PKCS1_SHA384, EVP_PKEY_RSA, NID_undef, &EVP_sha384, 0},
- {SSL_SIGN_RSA_PKCS1_SHA512, EVP_PKEY_RSA, NID_undef, &EVP_sha512, 0},
-
- {SSL_SIGN_RSA_PSS_SHA256, EVP_PKEY_RSA, NID_undef, &EVP_sha256, 1},
- {SSL_SIGN_RSA_PSS_SHA384, EVP_PKEY_RSA, NID_undef, &EVP_sha384, 1},
- {SSL_SIGN_RSA_PSS_SHA512, EVP_PKEY_RSA, NID_undef, &EVP_sha512, 1},
-
- {SSL_SIGN_ECDSA_SHA1, EVP_PKEY_EC, NID_undef, &EVP_sha1, 0},
- {SSL_SIGN_ECDSA_SECP256R1_SHA256, EVP_PKEY_EC, NID_X9_62_prime256v1,
- &EVP_sha256, 0},
- {SSL_SIGN_ECDSA_SECP384R1_SHA384, EVP_PKEY_EC, NID_secp384r1, &EVP_sha384,
- 0},
- {SSL_SIGN_ECDSA_SECP521R1_SHA512, EVP_PKEY_EC, NID_secp521r1, &EVP_sha512,
- 0},
-
- {SSL_SIGN_ED25519, EVP_PKEY_ED25519, NID_undef, NULL, 0},
- };
-
- static const SSL_SIGNATURE_ALGORITHM *get_signature_algorithm(uint16_t sigalg) {
- for (size_t i = 0; i < OPENSSL_ARRAY_SIZE(kSignatureAlgorithms); i++) {
- if (kSignatureAlgorithms[i].sigalg == sigalg) {
- return &kSignatureAlgorithms[i];
- }
- }
- return NULL;
- }
-
- int ssl_has_private_key(const SSL *ssl) {
- return ssl->cert->privatekey != NULL || ssl->cert->key_method != NULL;
- }
-
- static int pkey_supports_algorithm(const SSL *ssl, EVP_PKEY *pkey,
- uint16_t sigalg) {
- const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
- if (alg == NULL ||
- EVP_PKEY_id(pkey) != alg->pkey_type) {
- return 0;
- }
-
- if (ssl3_protocol_version(ssl) >= TLS1_3_VERSION) {
- /* RSA keys may only be used with RSA-PSS. */
- if (alg->pkey_type == EVP_PKEY_RSA && !alg->is_rsa_pss) {
- return 0;
- }
-
- /* EC keys have a curve requirement. */
- if (alg->pkey_type == EVP_PKEY_EC &&
- (alg->curve == NID_undef ||
- EC_GROUP_get_curve_name(
- EC_KEY_get0_group(EVP_PKEY_get0_EC_KEY(pkey))) != alg->curve)) {
- return 0;
- }
- }
-
- return 1;
- }
-
- static int setup_ctx(SSL *ssl, EVP_MD_CTX *ctx, EVP_PKEY *pkey, uint16_t sigalg,
- int is_verify) {
- if (!pkey_supports_algorithm(ssl, pkey, sigalg)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_WRONG_SIGNATURE_TYPE);
- return 0;
- }
-
- const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
- const EVP_MD *digest = alg->digest_func != NULL ? alg->digest_func() : NULL;
- EVP_PKEY_CTX *pctx;
- if (is_verify) {
- if (!EVP_DigestVerifyInit(ctx, &pctx, digest, NULL, pkey)) {
- return 0;
- }
- } else if (!EVP_DigestSignInit(ctx, &pctx, digest, NULL, pkey)) {
- return 0;
- }
-
- if (alg->is_rsa_pss) {
- if (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) ||
- !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1 /* salt len = hash len */)) {
- return 0;
- }
- }
-
- return 1;
- }
-
- static int legacy_sign_digest_supported(const SSL_SIGNATURE_ALGORITHM *alg) {
- return (alg->pkey_type == EVP_PKEY_EC || alg->pkey_type == EVP_PKEY_RSA) &&
- !alg->is_rsa_pss;
- }
-
- static enum ssl_private_key_result_t legacy_sign(
- SSL *ssl, uint8_t *out, size_t *out_len, size_t max_out, uint16_t sigalg,
- const uint8_t *in, size_t in_len) {
- /* TODO(davidben): Remove support for |sign_digest|-only
- * |SSL_PRIVATE_KEY_METHOD|s. */
- const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
- if (alg == NULL || !legacy_sign_digest_supported(alg)) {
- OPENSSL_PUT_ERROR(SSL, SSL_R_UNSUPPORTED_PROTOCOL_FOR_CUSTOM_KEY);
- return ssl_private_key_failure;
- }
-
- const EVP_MD *md = alg->digest_func();
- uint8_t hash[EVP_MAX_MD_SIZE];
- unsigned hash_len;
- if (!EVP_Digest(in, in_len, hash, &hash_len, md, NULL)) {
- return ssl_private_key_failure;
- }
-
- return ssl->cert->key_method->sign_digest(ssl, out, out_len, max_out, md,
- hash, hash_len);
- }
-
- enum ssl_private_key_result_t ssl_private_key_sign(
- SSL_HANDSHAKE *hs, uint8_t *out, size_t *out_len, size_t max_out,
- uint16_t sigalg, const uint8_t *in, size_t in_len) {
- SSL *const ssl = hs->ssl;
- if (ssl->cert->key_method != NULL) {
- enum ssl_private_key_result_t ret;
- if (hs->pending_private_key_op) {
- ret = ssl->cert->key_method->complete(ssl, out, out_len, max_out);
- } else {
- ret = (ssl->cert->key_method->sign != NULL
- ? ssl->cert->key_method->sign
- : legacy_sign)(ssl, out, out_len, max_out, sigalg, in, in_len);
- }
- hs->pending_private_key_op = ret == ssl_private_key_retry;
- return ret;
- }
-
- *out_len = max_out;
- EVP_MD_CTX ctx;
- EVP_MD_CTX_init(&ctx);
- int ret = setup_ctx(ssl, &ctx, ssl->cert->privatekey, sigalg, 0 /* sign */) &&
- EVP_DigestSign(&ctx, out, out_len, in, in_len);
- EVP_MD_CTX_cleanup(&ctx);
- return ret ? ssl_private_key_success : ssl_private_key_failure;
- }
-
- int ssl_public_key_verify(SSL *ssl, const uint8_t *signature,
- size_t signature_len, uint16_t sigalg, EVP_PKEY *pkey,
- const uint8_t *in, size_t in_len) {
- EVP_MD_CTX ctx;
- EVP_MD_CTX_init(&ctx);
- int ret = setup_ctx(ssl, &ctx, pkey, sigalg, 1 /* verify */) &&
- EVP_DigestVerify(&ctx, signature, signature_len, in, in_len);
- EVP_MD_CTX_cleanup(&ctx);
- return ret;
- }
-
- enum ssl_private_key_result_t ssl_private_key_decrypt(
- SSL_HANDSHAKE *hs, uint8_t *out, size_t *out_len, size_t max_out,
- const uint8_t *in, size_t in_len) {
- SSL *const ssl = hs->ssl;
- if (ssl->cert->key_method != NULL) {
- enum ssl_private_key_result_t ret;
- if (hs->pending_private_key_op) {
- ret = ssl->cert->key_method->complete(ssl, out, out_len, max_out);
- } else {
- ret = ssl->cert->key_method->decrypt(ssl, out, out_len, max_out, in,
- in_len);
- }
- hs->pending_private_key_op = ret == ssl_private_key_retry;
- return ret;
- }
-
- RSA *rsa = EVP_PKEY_get0_RSA(ssl->cert->privatekey);
- if (rsa == NULL) {
- /* Decrypt operations are only supported for RSA keys. */
- OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
- return ssl_private_key_failure;
- }
-
- /* Decrypt with no padding. PKCS#1 padding will be removed as part
- * of the timing-sensitive code by the caller. */
- if (!RSA_decrypt(rsa, out_len, out, max_out, in, in_len, RSA_NO_PADDING)) {
- return ssl_private_key_failure;
- }
- return ssl_private_key_success;
- }
-
- int ssl_private_key_supports_signature_algorithm(SSL_HANDSHAKE *hs,
- uint16_t sigalg) {
- SSL *const ssl = hs->ssl;
- if (!pkey_supports_algorithm(ssl, hs->local_pubkey, sigalg)) {
- return 0;
- }
-
- /* Ensure the RSA key is large enough for the hash. RSASSA-PSS requires that
- * emLen be at least hLen + sLen + 2. Both hLen and sLen are the size of the
- * hash in TLS. Reasonable RSA key sizes are large enough for the largest
- * defined RSASSA-PSS algorithm, but 1024-bit RSA is slightly too small for
- * SHA-512. 1024-bit RSA is sometimes used for test credentials, so check the
- * size so that we can fall back to another algorithm in that case. */
- const SSL_SIGNATURE_ALGORITHM *alg = get_signature_algorithm(sigalg);
- if (alg->is_rsa_pss &&
- (size_t)EVP_PKEY_size(hs->local_pubkey) <
- 2 * EVP_MD_size(alg->digest_func()) + 2) {
- return 0;
- }
-
- /* Newer algorithms require message-based private keys.
- * TODO(davidben): Remove this check when sign_digest is gone. */
- if (ssl->cert->key_method != NULL &&
- ssl->cert->key_method->sign == NULL &&
- !legacy_sign_digest_supported(alg)) {
- return 0;
- }
-
- return 1;
- }
|